What is descriptive of most cases of hemophilia?
a. Autosomal dominant disorder causing deficiency is a factor involved in the
blood-clotting reaction
b. X-linked recessive inherited disorder causing deficiency of platelets and
prolonged bleeding
c. X-linked recessive inherited disorder in which a blood-clotting factor is deficient
d. Y-linked recessive inherited disorder in which the red blood cells become moon
shaped
C
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A The inheritance pattern is X-linked recessive.
B The disorder involves coagulation factors, not platelets.
C The inheritance pattern in 80% of all of the cases of hemophilia is X-linked
recessive. The two most common forms of the disorder are factor VIII
deficiency, hemophilia A or classic hemophilia; and factor IX deficiency,
hemophilia B or Christmas disease.
D The disorder does not involve red cells or the Y chromosome.
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